STAR

1
STAR Photon Multiplicity Detector
2
PMD Layout
1550 mm
PMD FRONT VIEW Red line is the separation line
of the two halves of PMD
3
SUPER MODULE Step by Step
UNITMODULE
SUPERMODULE
UNIT CELL
4
Single Cell Design

• Cathode Material 0.2mm thick copper sheet
• Anode wire 20 micron Au plated Tungsten
• Anode wire Tension 25 grams
• End caps standard 1.6 mm thick FR4 PCB

5
UNIT Module
Unit Module Components
Gassiplex board plugged onto the connector

• Each unit module contains
• 24x24 array of cells (576)
• Size of unit module
• Rhombus of side 255 mm
• Weight of unit module 700 gm

6
Unit Module Quality Control

• Assembly of 2 PCBS and honeycomb
• Soldering of wires
• Visual inspection
• Resistance measurement
• Gluing of holes
• Wire cutting
• Visual inspection continuity check

Resistance plot here
7
Gassiplex Electronics Board On the Detector
One Unit Module is Read by 9 Gassiplex
boards. Full Readout Chain Max 27 boards per
chain, 24 x 2 chains One Translator Board One
buffer Board

• A 4 layer PCBs containing
• 4 gassiplex chips
• 64 channels signal connector
• One 3-pin mate-n-lock AMP connector for low
  voltage
• Two 10-pin ribbon cable connectors for signal
  daisy chaining
• 2 piggy back boards for HV protection

8
Gassiplex Electronics Board on the Detector

• One Unit Module is Read by 9 Gassiplex boards.
• Full Readout Chain
• Max 27 boards per chain 24 x 2 chains
• One Translator Board
• One buffer Board

9
GASSIPLEX CHIP TESTING
2D Pedestal Spread Plot Here.
Gassiplex Chip Testing in Progress, 10K chips
tested, Manually and with DAQ
10
UNIT MODULE TESTING
Can we show here some picture/plots from Cosmic
ray test setup for Unit Module
11
Super Modules
Total number of supermodules 24 SM4 (with 4
unit modules) 6 SM5(with 5 unit modules)
2 SM6 (with 6 unit modules) 10 SM8 (with 8 unit
modules) 4 SM9 (with 9 unit modules) 2
Drawing of SM8
77.9 cm
12
Assembly of SuperModule

• Supermodule consists of
• a FR4 bottom plate and an
• Aluminum channel boundary
• wall which also serves as gas
• inlet/outlet channel.
• Unit modules when integrated
• into the housing form a gas tight
• assembly with the boundary
• frames sealed by silicone
• sealant.

Schematic of a section of the supermodule
13
FIRST SUPER MODULE
Preliminary tests performed on SM before shipping
to CERN 1. Gas leakage test 2. HV test (50V
above operating Voltage) 3. Pedestal with
boards on the detector. 4. Signal seen on
Cosmic.
14
SuperModule Test at CERN
Pion beam with 1 GeV/c to 6 GeV/c (MIP
study) Electron beam with 1GeV/c to 6 GeV/c
(preshower study)
15
Preshower Data
ADC distribution for electrons At 3X0
Calibration curve
16
Support Mechanism of PMD
South
North
17
PMD in WAH
18
PMD Position in WAH
Wall Brackets (North)
19
Support Structure during fabrication
20
Gas System

• The detector operates at
• atmospheric pressure with
• a pressure relief valve
• in the mixer.
• The output impedance for
• flow is lower than the input
• impedance.

21
Progress report on Fabrication (since last
meeting)
22
(No Transcript)
23
Progress Report on FEE
(Tested)
24
DAQ and supports
25
Job at BNL (July-October 2002)